com.itextpdf.text.pdf.security
Interface ExternalSignature

All Known Implementing Classes:

PrivateKeySignature

public interface ExternalSignature

Interface that needs to be implemented to do the actual signing. For instance: you'll have to implement this interface if you want to sign a PDF using a smart card.

Author:

Paulo Soares

Method Summary

String	getEncryptionAlgorithm() Returns the encryption algorithm used for signing.
String	getHashAlgorithm() Returns the hash algorithm.
byte[]	sign(byte[] message) Signs it using the encryption algorithm in combination with the digest algorithm.

Method Detail

getHashAlgorithm

String getHashAlgorithm()

Returns the hash algorithm.

Returns:

the hash algorithm (e.g. "SHA-1", "SHA-256,...")

getEncryptionAlgorithm

String getEncryptionAlgorithm()

Returns the encryption algorithm used for signing.

Returns:

the encryption algorithm ("RSA" or "DSA")

sign

byte[] sign(byte[] message)
            throws GeneralSecurityException

Signs it using the encryption algorithm in combination with the digest algorithm.

Parameters:

message - the message you want to be hashed and signed

Returns:

a signed message digest

Throws:

GeneralSecurityException